Letter opener



FIG. 1 is a perspective view of a letter opener embodying my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for a letter opener, as shown.